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/*

 *  Instantiate the clock driver shell for psim based

 *  on the decrementer register.

 *

 *  clock.c,v 1.6 2001/08/16 19:38:05 joel Exp

 */

#include <rtems.h>

/*

 *  If defined, speed up the clock ticks while the idle task is running so

 *  time spent in the idle task is minimized.  This significantly reduces

 *  the wall time required to execute the RTEMS test suites.

 */

#define CLOCK_DRIVER_USE_FAST_IDLE

#define CLOCK_VECTOR PPC_IRQ_DECREMENTER

/*  On psim, each click of the decrementer register corresponds

 *  to 1 instruction.  By setting this to 100, we are indicating

 *  that we are assuming it can execute 100 instructions per

 *  microsecond.  This corresponds to sustaining 1 instruction

 *  per cycle at 100 Mhz.  Whether this is a good guess or not

 *  is anyone's guess.

 */

extern int PSIM_INSTRUCTIONS_PER_MICROSECOND;

unsigned int PPC_DECREMENTER_CLICKS;

#define Clock_driver_support_install_isr( _new, _old ) \

  do { \

    _old = (rtems_isr_entry) set_vector( _new, CLOCK_VECTOR, 1 ); \

    PPC_DECREMENTER_CLICKS = (unsigned int)&PSIM_INSTRUCTIONS_PER_MICROSECOND; \

    PPC_DECREMENTER_CLICKS *= rtems_configuration_get_microseconds_per_tick(); \

    /* PPC_DECREMENTER_CLICKS = 5000; */ \

  } while(0)

#define Clock_driver_support_initialize_hardware() \

  do { \

    unsigned int _clicks = PPC_DECREMENTER_CLICKS; \

    PPC_Set_decrementer( _clicks ); \

  } while (0)

#define Clock_driver_support_at_tick() \

  Clock_driver_support_initialize_hardware()

#define Clock_driver_support_shutdown_hardware()

#include "../../../shared/clockdrv_shell.c"